Screen-covered cylindrical roll for paper-making machines.



H. 0. OLSEN. SCREEN COVERED CYLINDRICAE ROLL FOR PAPER MAKING MACHINES.

APPLICATION FILED NOV- 6.19I5- Patented Aug. 29,

JQTTORIVEY m: Noi'ms PEHTRS co FNGYD LIIHO. wAsnmnmM n c HAROLD O. OLSEN, 0F WATERTO-WN, NEW YORK.

SCREEN-COVERED CYLINDRICAL ROLL FOR PAPER-EAKING MACHINES.

Specification of Letters Patent.

Patented am. as, mic,

Application filed. November 6, 1915. Serial No. 60,120."

To all whom it may concern: 7

Be it known that I, HAROLD O. OLSEN, a citizen of the United States of America, and resident of l/Vatertown, in the county of Jefferson, in the State of New York, have invented new and useful Tmprovementsin Screen-Covered Cylindrical Rolls forlPa'per- Making Machines, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact de: scription.

This invention relates to certain improvements in screen covered cylindrical rolls for paper making -machines, and refers more particularly to means for fastening the screens to the cylinders to prevent buckling or wrinkling of the screen due to longitudinal or transverse creeping of the end edges thereof, more particularly while the cylinder is in action. These screens are made in widths corresponding to the lengths of the cylinders to which they are to be applied v and are cut in lengths corresponding to the circumference of such cylinders around whichv they are tightly drawn, and their meeting ends firmly secured together to produce a smooth even surface.

In operation it is found that the ends of the screens tend to draw in from the heads of the. cylinder between the center thereof causing more or less wrinkling or buckling of the central portions thereof which not only produces excessive strain upon the screen, but produces corresponding impressions in the paper, leaving the latter in a moreor less mutilated or wrinkled condition, and, so far as I am aware, no adequate provision has yet been made to entirely obviate this difficulty.

The main object, therefore, is to provide a more expeditious and effective means for fastening the ends of the screen upon the cylinder so that all portions thereof will lie smoothly upon the periphery of the cylin der during the process of paper making in the machine in which the cylinder is employed, thereby assuring the production of abetter quality ofpaper by reducing the liability of impressing wrinkles or creases therein.

Other objects and uses relatingv tospecific parts of the device will be brought out in the following description.

In the drawings Figure 1 is a face view of a screen covered roll or cylinder embodying the features of my invention. Fig. 2 is an 1 enlarged sectional perspective view of one endof the same roll or cylinder. Fig. 3 is a detail sectional view through a. portion of one endof the cylinder showing the method of threading the screen fastener through one of the dowels. Fig. 4: is a perspective view of a portion of the detached wire fastener for the screen as itappears when, threaded through the dowels and screens.

The cylinder may be of any suitable length or diameter and preferably comprises end heads l connected by spokes -2-, to a hub 3 which is secured to a shaft 4, the end heads being connected by dowels 5, preferably of brass, arranged circumferentially about the axis of the shaft in parallelism and in uniformly spaced relation relatively short distances apart and having. their ends. seated in suitable sockets in the heads 1 which serve to hold them in fixed relation lengthwise of the cylinder and parallel with the axis thereof.

A screen 6 of comparatively coarse mesh and of substantially the same axial width and circumferential length as the cylinder between the end heads 1 is wrapped tightly aroundand upon the outer faces of the dowels -5, and itsmeeting ends suitably secured together to form a substantially smooth supporting base for an outer screen 7 of relatively fine mesh. Thiszouter screen 7- is of substantially the same dimensions as the inner screen 6 and is tightly wrapped on the periphery thereof and its ends permanently joined together to form a substantially smooth exteriorsurface in so far as it is free from wrinklesor buckling and together with the innensupporting screen constitutes what may be termed a laminated foraminous drum of circular cross section tightly wrapped around and upon the outer faces of the dowels and extending the entire length of the space between the end'heads of the cylinder. The opposite ends of this laminated screen drum are firmly secured to the adjacent portions of the dowels, preferably by means of wire fasteners -8--, each fastener preferably consisting of a single piece of. wire threaded through radial apertures 9- in successive dowels from a predetermined point through and across the outer face of adjacent portions of the screen drum, said wires being drawnctightly during the threading process to firmly bind the screen to the outer surfaces of the dowels against relative endwise or circumferential movement, and the ends of each wire which are finally at the point of beginning are twisted firmly together as at l() to hold them against loosening and thereby retaining the screen drum in place.

As illustrated, each end of each dowel near the adjacent end head 1- is provided with a pair of radial apertures 9 spaced longitudinally a suitable distance apart to permit the adjacent -wire fastener to be drawn through both apertures of each dowel and also throughand across the outer face of the adjacent portion of the screen drum, thereby aflording two points of attachment of the screen to each dowel.

In practice the end of each wire fastener is threaded from the inside through one of the apertures, preferably the inner one, of one of the dowels and through the portion of the screen alined with that apertured, the end of the wire being then drawn still farther through the periphery of the screen across the outer face thereof and reentered through the other aperture of the same dowel, thus producinga loop or staple binding the adjacent portion of the screen to that particular dowel, whereupon the same end of the wire fastener is drawn circumferentially and entered through the corresponding aperture of the next adjacent dowel and contiguous portion of the screen to the exterior thereof and then returned across the face of the screen and reentered through the other aperture of the second dowel, thus forming another loop or staple binding the adjacent portion of the screen to the second dowel. This operation is repeated through the apertures of successive dowels and through the contiguous portions of the screen until the advance end of the wire fastener is returned to the point of beginning where it is twisted at 10 to the other end in the manner just previously de scribed, thus producing a circumferential series of wire loops or staples 8' running relatively short distances lengthwise of the drum in uniformly spaced relation circumferentially corresponding to the spacings of the dowels so that each end of the drum is fastened to each dowel by a lengthwise loop or staple and by making the wire fastener at each end of the drum continuous, the prongs of the loops or staples which are passed through the dowels and adjacent portions of the screen drum will be connected to each other across the space between the'dowels. That is, the outer end of the prongs of the same staple wlll be connected to the corresponding end of the next adjacent prong at the other side, and when each wire fastener is drawn tightly during the process of threading it through successive dowels and adjacent portions of the screen, it is evident that the ends of the screen drum will be firmly secured to the outer face of the dowels to prevent any possibility of creeping of the screens upon the dowels either longitudinally or circumferentially, the result of which will be to keep the periphery of the screen drum substantially smooth or free from wrinkles or buckling throughout its entire area. It is also evident that by fastening each end of the screen to each dowel at two points of attachment in spaced relation lengthwise of the dowel, the liability of excessive shearing strain upon either point of attachment will be materially reduced, thereby prolonging the life of the screen and fastener and, therefore, increasing the period of usefulness of the entire cylinder.

The exposed portions of the loops or staples 8' at the periphery of the drum are covered by bands 11 of fabric or equivalent material commonly known as decker bands to protect them from excessive wear by contact with external objects, it being understood that the working face of the drum across which the paper is fed is located between these ClGCkGIb&I1dS.

The apertures in the dowels through which the wire fasteners are passed are of just sufficient size to receive the same, thereby additionally holding the screen drum against relative endwise or circumferential movement.

What I claim is:

l. A cylindrical mold for paper making machines comprising end heads, a circumferential series of dowels connecting said heads, each end of each dowel having a pair of radial apertures therethrough in spaced relation lengthwise thereof, a screen drum drawn tightly around and upon the dowels between the heads, and wire fasteners )assed throughthe apertures in each dowe and through the adjacent portions of the screen drum.

2. A cylindrical mold for paper making machines comprising opposite circular end heads, a circumferential series of dowels connecting said heads and spaced uniform distances apart circumferentially, each end of each dowel being provided with a pair of apertures therethrough in spaced relation lengthwise thereof, a screen drum drawn tightly around and upon the outer faces of the dowels, and wire loops passed through the apertures'of their corresponding dowels and engaging the outer faces of adjacent portions of the screen drum, adjacent loops being connected to each other at one end at the inner sides of the dowels.

3. In a cylindrical mold of the character faces of adjacent portions of the screen drum for securing said drum to the dowels.

In witness whereof I have hereunto set my hand this 28th day of October, 1915.

HAROLD O. OLSEN.

described, the combination of end heads, dowels connecting said heads and spaced circumferentially uniform distances apart about the axis of the cylinder, a screen drum wound tightly around and upon the dowels between the heads, and wire fastening devices passed through apertures in successive dowels and through and across the outer Witnesses:

ANNIs A. STERLING, HENRY M. BROWN.

topics of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

- Washington, D. G. 

